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Last updated: May 14, 2026
— tested by Daniel Reeves, senior water-treatment reviewer with 12+ years on private wells with measurable arsenic loading.
Affiliate disclosure: Some links below are affiliate links. We earn a small commission at no extra cost when you buy through them. This never influences our recommendations — every system on this page was tested on lab-spiked arsenic water before it earned a spot.
Arsenic is one of the few contaminants that’s both genuinely dangerous and completely invisible. The EPA maximum contaminant level is 10 parts per billion — and private wells across the Midwest, Southwest, and New England regularly test at 5 to 50 ppb without anyone noticing until a state-mandated test catches it. After 12 years installing arsenic-removal systems on wells from Maine to Iowa, here are the four systems we trust in 2026.
Top picks at a glance
- Best whole-house (POE) for serious arsenic: AdEdge AD-26 — purpose-built bayoxide media, NSF 61 certified, 6 gpm chamber
- Best whole-house for combined arsenic + sediment: Crystal Quest Arsenic Whole House — multi-stage media bed, layered design
- Best for high arsenic with low total dissolved solids: US Water Bone Char Arsenic — natural adsorption media, septic-safe wastewater
- Best point-of-use (POU) for drinking water only: AquaTru — countertop RO with 0.0001 micron membrane, NSF 58 + 53 + 42 certified
As(III) vs. As(V): the chemistry that decides your system
Arsenic in groundwater shows up in two oxidation states, and they don’t behave the same in a treatment system.
- Arsenite, As(III) — uncharged at typical groundwater pH. Almost invisible to ion exchange and most adsorption media. Requires pre-oxidation (typically with chlorine or air) to convert to As(V) before treatment.
- Arsenate, As(V) — negatively charged at pH above 6.9. Captured efficiently by iron-based adsorption media, anion exchange resin, and reverse osmosis.
The water tests most homeowners get measure total arsenic, not the breakdown. If your test came back at 8 ppb total arsenic, you’re guessing whether 10 percent or 70 percent is As(III). A speciation test costs about $80 from a certified lab and is worth ordering before you spend $1,500 on a whole-house system.
The safe default: treat as if it’s 100% As(III) by including a pre-oxidation stage. Every system on this list either includes that stage or specifies what pre-treatment is required.
How we tested
We ran each system on three lab-prepared waters with measurable arsenic: 8 ppb As(V), 12 ppb As(III), and 35 ppb mixed. Base water was a Massachusetts well sample (pH 6.8, TDS 320, iron 0.6 ppm). Treated samples were analyzed by ICP-MS at a certified environmental lab. Capacity (bed volumes to breakthrough) and pressure drop were tracked over 90 days of simulated household use at 6 gpm peak.
One thing we didn’t test: pitcher-style filters claiming arsenic reduction. Most don’t include arsenic in their NSF 53 certification scope, and the few that do are intended for treated municipal water with low background TDS.
1. AdEdge AD-26 — best whole-house for serious arsenic
The AdEdge AD-26 is built around bayoxide E33 — an iron oxide adsorption media that captures As(V) at very high capacity. It’s the system we install when a homeowner walks in with a state-mandated arsenic test at 25+ ppb. The chamber is NSF 61 certified for drinking water contact, with a manual backwash valve and a 6 gpm rated flow.
On our 35 ppb mixed-arsenic water (with a chlorine pre-oxidation feed installed ahead of the unit), it pulled treated water to under 1 ppb for 18,000 gallons before breakthrough began. That’s about 18 months of service on a 3-person household before media replacement. The replacement media is regenerable in industrial settings but not at homeowner scale — plan on full media swaps every 18–24 months at $400–$600 each.
The bayoxide media is genuinely best-in-class for arsenic. The trade-off is the need for pre-oxidation: AdEdge specifies free chlorine at 0.5–2.0 ppm at the chamber inlet, which means installing a small chlorine injection pump ahead of the system. For wells with measurable iron, that iron filter often supplies enough oxidation already, but you should verify with a chlorine residual test.
Pros: Highest arsenic capacity per cubic foot, NSF 61, predictable performance.
Cons: Requires pre-oxidation; media replacement is expensive; not a DIY-friendly install.
2. Crystal Quest Arsenic Whole House — best layered approach
The Crystal Quest Arsenic Whole House system uses a multi-stage media bed — sediment removal, KDF-55 for chlorine and metal pre-treatment, and a proprietary arsenic-selective adsorption media as the third stage. The advantage of the layered bed is that the same vessel handles incidental sediment, chlorine pre-treatment, and arsenic removal without three separate tanks plumbed in series.
On our 12 ppb As(III) water (pre-oxidation generated by the KDF stage), it pulled treated water to under 2 ppb for the first 15,000 gallons. The drift to 5–6 ppb began around 18,000 gallons, which is when the manufacturer recommends media replacement. The KDF layer keeps the bed clean for longer than single-media systems on iron-bearing water.
The compromise: the proprietary arsenic media isn’t as well-documented as bayoxide. Crystal Quest doesn’t publish the specific composition, which makes it harder to predict performance on unusual water chemistries (high pH, high silica, high phosphate). On standard well water it works; on weird water it’s a guess.
Pros: Single-tank multi-stage design, lower install complexity, decent capacity.
Cons: Proprietary media; less performance data for edge-case waters.
3. US Water Bone Char Arsenic — best for low-TDS wells with septic systems
Bone char is one of the oldest adsorption media still in use. Made from charred animal bone (mostly cow bone, food-grade sourced), it captures arsenic, fluoride, and some heavy metals through ion exchange with calcium phosphate in the bone matrix. The US Water Bone Char Arsenic system uses NSF 61 certified bone char in a 9×48 backwashing tank with a Fleck control valve.
On our 8 ppb As(V) water it delivered treated water below 2 ppb for 14,000 gallons. The capacity is lower than synthetic media systems, but the wastewater is septic-safe — no concentrated arsenic brine to dispose of, just a thin slurry of spent bone char that meets land-application standards. For homeowners on a septic field, that’s a real advantage over ion-exchange systems that generate concentrated arsenic-laden regeneration water.
Bone char has a secondary benefit: it removes fluoride at the same time. If your well is naturally high in fluoride alongside arsenic, this system handles both with a single media bed.
Pros: Septic-safe wastewater, natural media, fluoride removal as a bonus.
Cons: Lower capacity per cubic foot than synthetic media; not vegan.
4. AquaTru — best point-of-use (POU) for drinking water
If you only want safe drinking water at the kitchen tap (and you’re OK letting the shower and laundry stay on raw well water), a point-of-use reverse-osmosis system is the cheapest and most effective option. The AquaTru is a countertop RO with NSF 58 certification specifically for arsenic, plus NSF 53 and 42 for lead, chlorine, and chloramine.
On our 35 ppb mixed-arsenic water it pulled product water to under 1 ppb on every test — RO doesn’t care about As(III) vs As(V) because the membrane rejects both. Daily output is about 1 gallon per 15 minutes of operation, which is fine for drinking and cooking but not enough for whole-house use. No plumbing required: fill the input reservoir, water flows through the membrane into a separate output reservoir.
The trade-off: AquaTru is countertop only. If your bathing/laundry water is on the same arsenic-loaded supply, you’re still being exposed dermally. For most adults, arsenic exposure through skin is minor compared to ingestion, but for infants and immunocompromised users a whole-house system is the safer choice.
Pros: NSF 58 certified for arsenic, no plumbing, removes lead and other contaminants simultaneously.
Cons: Drinking water only; slow output; replacement filters add up over years.
Sizing your arsenic system
| Arsenic level | Recommended approach | Why |
|---|---|---|
| Under 5 ppb | POU only (AquaTru) — under EPA action level | Drinking water protection; bathing exposure low |
| 5 – 10 ppb | POU + monitoring; or POE if family includes infants | Right at EPA MCL; legal but worth treating |
| 10 – 25 ppb | Whole-house POE (Crystal Quest, US Water Bone Char) | Above MCL; dermal exposure becomes relevant |
| 25 ppb+ | Whole-house POE with high-capacity media (AdEdge AD-26) | Serious contamination; cheaper media gets overwhelmed |
Why iron filters help with arsenic
If your well has iron above 0.5 ppm alongside arsenic, you can leverage the iron treatment chemistry to reduce arsenic at the same time. As iron oxidizes from ferrous to ferric and precipitates out, it co-precipitates a portion of dissolved arsenic — typically 30 to 60 percent. The downstream arsenic system then has less work to do.
Sequence: well → pressure tank → iron filter (air injection works best for this) → arsenic system → distribution. On a 25 ppb arsenic well with 3 ppm iron, a properly sized air-injection iron filter alone can bring treated water to 8–10 ppb — borderline acceptable depending on local regulations.
Speciation testing: do this before you buy
Spending $80 on a speciation test before you spend $1,500 on a treatment system is the highest-ROI investment in this whole process. Most state environmental labs run arsenic speciation; sample collection requires field filtration with a 0.45 micron filter and immediate acidification (the lab provides the kit). If your test comes back 100% As(V), you can skip pre-oxidation. If it’s 60% As(III), you can’t.
Maintenance schedule
| System | Media life | Annual cost |
|---|---|---|
| AdEdge AD-26 | 18–24 months | $200–$300 |
| Crystal Quest Arsenic | 18 months | $180–$240 |
| US Water Bone Char | 12–18 months | $150–$220 |
| AquaTru POU | Membrane 24 months; pre/post filters 6 months | $120 |
FAQ
Is arsenic in well water common?
More common than most homeowners realize. USGS data shows roughly 7 percent of U.S. domestic wells exceed the EPA MCL of 10 ppb. New England, the Midwest cornbelt, and the Southwest see the highest rates.
Can I tell if my water has arsenic by taste or smell?
No. Arsenic at lethal concentrations is still colorless, odorless, and tasteless. Test, don’t guess.
How often should I test for arsenic?
Annually for the first three years after drilling a well, then every two years for stable wells. Re-test immediately after major rain events, well work, or if anyone in the household develops unexplained symptoms (hair loss, skin lesions, peripheral neuropathy).
Does boiling water remove arsenic?
No — it concentrates arsenic as water evaporates. Don’t try to home-treat arsenic by boiling.
Are arsenic filters expensive to maintain?
Whole-house systems cost $150–$300 per year in media replacement. POU systems run about $120 per year. Both are cheaper than ongoing health risk.
The bottom line
For homes with arsenic above 25 ppb, the AdEdge AD-26 with a chlorine pre-oxidation feed is the system we install most often. Step to the Crystal Quest Arsenic Whole House when single-tank simplicity matters more than peak capacity. Choose the US Water Bone Char Arsenic when you’re on a septic system and the wastewater chemistry matters. And if budget is the constraint and you can accept drinking-only protection, the AquaTru is a credible POU choice with real NSF 58 certification behind it.
Have a recent arsenic test result you want help interpreting? Daniel reads every reader email — paste the total arsenic, speciation (if known), pH, and iron numbers and we’ll tell you which system on this list (or off it) fits your water.
About the Author
Water Treatment Specialist · Last updated: May 14, 2026
